package com.example.utils;

import java.io.File;  
import java.io.FileInputStream;  
import java.io.IOException;  
import java.security.MessageDigest;  
  
import org.apache.commons.codec.binary.Hex;  
import org.apache.commons.codec.digest.DigestUtils;  
  
/** 
 *MD5计算工具 xuxile 2017-09-13 
 */  
public class Md5CaculateUtil {  
  
    /** 
     * 获取一个文件的md5值(可处理大文件) 
     * @return md5 value 
     */  
    public static String getMD5(File file) {  
        FileInputStream fileInputStream = null;  
        try {  
            MessageDigest MD5 = MessageDigest.getInstance("MD5");  
            fileInputStream = new FileInputStream(file);  
            byte[] buffer = new byte[8192];  
            int length;  
            while ((length = fileInputStream.read(buffer)) != -1) {  
                MD5.update(buffer, 0, length);  
            }  
            return new String(Hex.encodeHex(MD5.digest()));  
        } catch (Exception e) {  
            e.printStackTrace();  
            return null;  
        } finally {  
            try {  
                if (fileInputStream != null){  
                    fileInputStream.close();  
                    }  
            } catch (IOException e) {  
                e.printStackTrace();  
            }  
        }  
    }  
  
    /** 
     * 求一个字符串的md5值 
     * @param target 字符串 
     * @return md5 value 
     */  
    public static String MD5(String target) {  
        return DigestUtils.md5Hex(target);  
    }  
  
    public static void main(String[] args) {  
        long beginTime = System.currentTimeMillis();  
        File file = new File("D:/1/pdi-ce-7.0.0.0-24.zip");  
        String md5 = getMD5(file);  
        long endTime = System.currentTimeMillis();  
        System.out.println("MD5:" + md5 + "\n 耗时:" + ((endTime - beginTime) / 1000) + "s");  
    }  
} 